Selective catalytic reduction of nitric oxide by hydrogen over Zn-ZSM-5 and Pd and Pd/Ru based catalysts
Selective catalytic reduction of nitric oxide by hydrogen over Zn-ZSM-5 and Pd and Pd/Ru based catalysts
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DOI：
10.1016/j.apcatb.2014.01.036
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发表时间：
2014-06
影响因子：
22.1
通讯作者：
Lifeng Wang;Hao Chen;Minhao Yuan;S. Rivillon;E. H. Klingenberg;Jimmy X. Li;R. T. Yang
中科院分区：
文献类型：
--
作者：
Lifeng Wang;Hao Chen;Minhao Yuan;S. Rivillon;E. H. Klingenberg;Jimmy X. Li;R. T. Yang
首次研究了非贵金属催化剂Zn-ZSM-5在富氧条件下的H2-SCR催化还原NOx反应。结果表明，Zn-ZSM-5具有较高的H2-SCR催化活性，在250 °C有一个NOx转化峰，且具有较高的N2产物选择性。在相同的实验条件下，合成了Pd/Zn-ZSM-5和Pd/Ru/W/（ZrO 2-SiO2）SO 4两种贵金属基催化剂，评价了它们的H2-SCR活性，并与Zn-ZSM-5进行了比较。研究了原料气中CO浓度、水蒸气和SO2（NO、H2、余量He）对H2-SCR反应的影响。在Zn-ZSM-5上进行氢程序升温脱附（H2-TPD）实验：结果显示氢的强化学吸附，而化学吸附的氢的量和结合强度都随着氢计量加入温度而增加。讨论了Zn阳离子在化学吸附中的作用。
The catalytic reduction of NOxwith hydrogen (H2-SCR) in excess oxygen over a non-noble metal catalyst, Zn-ZSM-5, was studied for the first time. The results showed that Zn-ZSM-5 had considerable activity for H2-SCR, with a single NOxconversion peak at 250 °C, and high N2product selectivity. Two noble metal based catalysts, Pd/Zn-ZSM-5 and Pd/Ru/W/(ZrO2–SiO2)SO4, were also synthesized and their H2-SCR activities were evaluated and compared with Zn-ZSM-5 under identical laboratory experimental conditions. The effects of CO concentration, water vapor and SO2added to the feed gas (NO, H2, balance He) on H2-SCR over these three catalysts were also studied and compared. hydrogen temperature programmed desorption (H2-TPD) experiments were performed on Zn-ZSM-5: the results showed strong chemisorption of hydrogen, while both the amount and the binding strength of the chemisorbed hydrogen increased with the hydrogen dosing temperature. The role of Zn cations in the chemisorption is also discussed.